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Unformatted text preview: tory, your TA will
provide you with a blank "flow chart."
Record the correct answers here while you do the on-line exercise and bring these
answers to lab class with you.
Question 1. An unknown solution could contain any or all of the following cation: K+,
Ca2+, Cr3+, Mn2+, Fe3+, Co2+, Zn2+. A 1 mL portion of the unknown is treated with 2 mL
of 6 M NaOH, added a few drops at a time with shaking. Immediately thereafter 10
drops of 3% hydrogen peroxide are added dropwise with shaking, and the centrifuge tube
is then heated for a few minutes in a water bath until bubbling ceases.
The resulting conglomerate is then centrifuged and the supernatant liquid is decanted off
and saved. (Although you have not demonstrated these facts for yourself, Ca2+ will be
precipitated as the hydroxide at this stage and K+ will remain in the decanted liquid.)
At this stage of the experiment the elements that could be found in the decanted liquid
_____ ______ ______ _______ _______ _______ _______ _______ _______ 34 The elements that could be found in the remaining precipitate are:
_____ ______ ______ _______ _______ _____...
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This note was uploaded on 04/09/2013 for the course CHE CHE 2C taught by Professor Nasiri during the Spring '07 term at UC Davis.
- Spring '07